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-rw-r--r--diffcore-pickaxe.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/diffcore-pickaxe.c b/diffcore-pickaxe.c
new file mode 100644
index 0000000..ee22e36
--- /dev/null
+++ b/diffcore-pickaxe.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2005 Junio C Hamano
+ */
+#include "cache.h"
+#include "diff.h"
+#include "diffcore.h"
+#include "delta.h"
+
+static int contains(struct diff_filespec *one,
+ const char *needle, unsigned long len)
+{
+ unsigned long offset, sz;
+ const char *data;
+ if (diff_populate_filespec(one))
+ return 0;
+ sz = one->size;
+ data = one->data;
+ for (offset = 0; offset + len <= sz; offset++)
+ if (!strncmp(needle, data + offset, len))
+ return 1;
+ return 0;
+}
+
+void diff_pickaxe(struct diff_queue_struct *q, const char *needle)
+{
+ unsigned long len = strlen(needle);
+ int i;
+ struct diff_queue_struct outq;
+ outq.queue = NULL;
+ outq.nr = outq.alloc = 0;
+
+ for (i = 0; i < q->nr; i++) {
+ struct diff_filepair *p = q->queue[i];
+ if (!p->one->file_valid) {
+ if (!p->two->file_valid)
+ continue; /* ignore nonsense */
+ /* created */
+ if (contains(p->two, needle, len))
+ diff_queue(&outq, p->one, p->two);
+ }
+ else if (!p->two->file_valid) {
+ if (contains(p->one, needle, len))
+ diff_queue(&outq, p->one, p->two);
+ }
+ else if (contains(p->one, needle, len) !=
+ contains(p->two, needle, len))
+ diff_queue(&outq, p->one, p->two);
+ }
+ for (i = 0; i < q->nr; i++) {
+ struct diff_filepair *p = q->queue[i];
+ free(p);
+ }
+ free(q->queue);
+ *q = outq;
+ return;
+}